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Organic-inorganic hybrid super-hydrophilic coating as well as preparation method and application thereof

A super-hydrophilic, hybrid material technology, applied in coatings, devices for coating liquids on surfaces, pre-treatment surfaces, etc., can solve problems such as limitations, achieve stable hydrophilicity of coatings, simple preparation methods, and reactive mild conditions

Inactive Publication Date: 2011-11-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this hydrophilic treatment method requires the surface substrate to have a certain roughness, which has great limitations on the hydrophilic treatment method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Add 15g tetraethyl orthosilicate and 1.5g γ-(methacryloyloxy)propyltrimethoxysilane to 24.15g absolute ethanol, add 8.00g water while stirring and stir well, Then add 10% dilute hydrochloric acid dropwise while stirring to adjust the pH to 3.5, and hydrolyze at 60°C for 6 hours to obtain a hydrolyzate;

[0029] (2) Add the hydrolyzate in step (1), 15g of acrylic acid, and 0.495g of azobisisobutyronitrile to 100g of absolute ethanol, and carry out free radical polymerization at a water bath temperature of 85°C for 6 hours to prepare an organic-inorganic hybrid material;

[0030] (3) Add 115g of water to the organic-inorganic hybrid material obtained in step (2) under high-speed stirring at 1500 r / min, and stir for solvent replacement for 25 minutes, then depressurize ethanol at a water bath temperature of 75°C Evaporate, obtain water-based organic-inorganic hybrid superhydrophilic coating, and this coating is colorless and transparent;

[0031] (4) Wash the aluminu...

Embodiment 2

[0034] (1) Add 21g of tetraethyl orthosilicate and 1.5g of γ-(methacryloyloxy)propyltrimethoxysilane to 34.81g of absolute ethanol, and add 11.13g of water while stirring and stir well, Then add 10% dilute hydrochloric acid dropwise while stirring to adjust the pH to 3.5, and hydrolyze at 60°C for 6 hours to obtain a hydrolyzate;

[0035] (2) Add the hydrolyzate in step (1), 9g of acrylic acid, and 0.315g of azobisisobutyronitrile into 90g of absolute ethanol, and carry out free radical polymerization at a water bath temperature of 85°C for 6 hours to prepare an organic-inorganic hybrid material;

[0036] (3) Add 110 g of water to the organic-inorganic hybrid material obtained in step (2) under high-speed stirring at 1400 r / min, and stir for solvent replacement for 30 minutes, and then depressurize ethanol at a water bath temperature of 80°C Evaporate, obtain water-based organic-inorganic hybrid superhydrophilic coating, and this coating is colorless and transparent;

[0037...

Embodiment 3

[0040] (1) Add 27g of tetraethyl orthosilicate and 1.5g of γ-(methacryloyloxy)propyltrimethoxysilane to 43.75g of absolute ethanol, and add 14.39g of water while stirring and stir thoroughly. Then add 10% dilute hydrochloric acid dropwise while stirring to adjust the pH to 3.5, and hydrolyze at 60°C for 6 hours to obtain a hydrolyzate;

[0041] (2) Add the hydrolyzate in step (1), 3g of acrylic acid, and 0.135g of azobisisobutyronitrile into 80g of absolute ethanol, and carry out free radical polymerization at a water bath temperature of 85°C for 6 hours to prepare an organic-inorganic hybrid material;

[0042] (3) Add 110g of water to the organic-inorganic hybrid material obtained in step (2) under high-speed stirring at 1500 r / min, and stir for solvent replacement for 25 minutes, and then depressurize ethanol at a water bath temperature of 80°C Evaporate, obtain water-based organic-inorganic hybrid superhydrophilic coating, and this coating is colorless and transparent;

...

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Abstract

The invention discloses an organic-inorganic hybrid super-hydrophilic coating as well as a preparation method and an application thereof. The preparation method comprises: firstly carrying out hydrolysis condensation polymerization by a sol-gel method with ethyl orthosilicate used as a precursor, hydrochloric acid used as a catalyst, ethanol used as a solvent, a silane coupling agent used as a modifier and a proper amount of water to obtain a modified silica sol, then carrying out free radical polymerization on the modified silica sol and reactive hydrophilic monomers to obtain an organic-inorganic hybrid material, and carrying out solvent replacement to obtain an aqueous organic-inorganic hybrid super-hydrophilic coating. The coating is coated on plastics, glass or metal substrates through dipping or brushing to form a coating layer, the coating layer has a contact angle with water less than 5 degrees, the adhesion force with the substrates of level-0 and the hardness greater than 6H, and water drops can spread out quickly on the coating layer.

Description

technical field [0001] The present invention relates to a superhydrophilic coating, in particular to an organic-inorganic hybrid superhydrophilic coating; the present invention also relates to the preparation method of the organic-inorganic hybrid superhydrophilic coating and the application of the hydrophilic coating Application of preparing organic-inorganic hybrid superhydrophilic coating. technical background [0002] Under normal circumstances, the surface of the material has different degrees of water repellency. For this reason, it is necessary to carry out hydrophilic treatment on the surface of the material. Hydrophilic treatment is divided into inorganic treatment, organic treatment and organic-inorganic composite treatment. The surface obtained by surface modification with a contact angle of <5° with water droplets is called a super-hydrophilic surface, and there are generally two methods for the formation of a super-hydrophilic surface, with different mechan...

Claims

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Application Information

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IPC IPC(8): C09D151/10C08F292/00B05D7/24B05D3/02
Inventor 程江陶玉红皮丕辉蔡智奇文秀芳郑大锋杨卓如
Owner SOUTH CHINA UNIV OF TECH
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